If a doctor has just laid out a radiation plan for someone you love, the first question is usually the simplest one: will Medicare pay for it? Yes, it does, and what you actually owe comes down to something most people don't expect: the setting where the treatment happens. Medicare covers medically necessary radiation therapy for cancer and other conditions, but whether Part A or Part B pays, and how much lands on you, depends on whether you're treated as a hospital inpatient or an outpatient.

In This Guide

Does Medicare Cover Radiation Therapy?

Yes. Medicare covers medically necessary radiation therapy, and not just for cancer. It applies to other conditions where radiation is the right treatment too. So if radiation is part of the plan your oncologist put together, the coverage question is largely settled. Radiation therapy is a covered Medicare benefit.

The part that surprises people is that Medicare doesn't have one single "radiation" bucket that pays the same way for everyone. Instead, two different parts of Medicare can pick up the tab, and which one applies depends on whether you are treated as a hospital inpatient or as an outpatient. That distinction sounds like paperwork, but it's the whole ballgame when it comes to what you'll owe. Let's walk through both.

What You'll Pay: The Setting Decides

Here's the rule in one line: inpatient radiation runs through Part A, and outpatient radiation runs through Part B. Same treatment, different math depending on where you're sitting when you get it.

If you're a hospital inpatient. When radiation is delivered during a hospital stay where you've been formally admitted as an inpatient, Part A is the part that covers it. You pay the Part A deductible, which is $1,736 per benefit period in 2026, plus any coinsurance that applies., For most people, radiation isn't something that happens during an inpatient stay, so this is the less common path. But if radiation is part of an admission, this is how it's billed.

If you're an outpatient. This is how the large majority of radiation is actually delivered. You come in, get your treatment, and go home the same day, often across many sessions over several weeks. Part B covers outpatient radiation, and you pay 20% of the Medicare-approved amount after you've met the Part B deductible, which is $283 in 2026.,

And here's a detail that saves a lot of confusion: it doesn't matter whether you get that outpatient radiation in a hospital's outpatient department or in a doctor's office or freestanding radiation clinic. Either way, Part B covers it and you pay the same 20% after the deductible. The location changes how Medicare pays the provider behind the scenes, but your share of the bill lands in the same place.

One thing worth flagging, because radiation is rarely a one-and-done visit: that 20% coinsurance applies to each covered service. A typical course of radiation is many sessions, so the out-of-pocket adds up across the full course, not just a single day. If your family member has supplemental coverage, like a Medigap policy or a Medicare Advantage plan, that coverage may pick up part or all of the coinsurance. It's worth checking what they have before treatment starts.

Modern Techniques: IMRT, Proton Beam, and the Rest

Radiation isn't the blunt instrument it was decades ago. Today it comes in a range of precise, targeted forms, and Medicare's coverage keeps pace with them. The modern techniques, including intensity-modulated radiation therapy (IMRT), stereotactic body radiation therapy (SBRT), stereotactic radiosurgery (SRS), brachytherapy, and proton beam therapy, are covered when they're medically necessary.

The phrase "when medically necessary" is doing real work in that sentence. Whether a specific technique is covered for a specific diagnosis is decided by Medicare's coverage rules, called national coverage determinations (NCDs). Where no national rule covers a situation, the regional Medicare contractors that process claims set the terms through Local Coverage Determinations (LCDs). In plain terms: the general answer is that these advanced techniques are covered, but the specifics for a given cancer and a given technique come down to those coverage determinations. Your radiation oncology team deals with this constantly and can tell you whether the technique they're recommending is covered for your situation.

What Medicare Covers in Radiation Therapy Sessions

When Part B pays for radiation therapy, it isn't only paying for the beam. By regulation, Part B covers X-ray therapy and other radiation therapy services, including radium therapy and radioactive isotope therapy, along with the materials used and the services of the technicians who administer the treatment. So the pieces that make a treatment session happen are part of the covered service, not separate charges you have to chase down.

The services also have to be furnished under the required level of physician supervision. That's standard for this kind of care and something the treating facility handles as a matter of course, not something you need to arrange.

Frequently Asked Questions

Does Medicare cover radiation therapy for cancer?

Yes. Medicare covers medically necessary radiation therapy for cancer and other conditions. Which part of Medicare pays depends on the setting: Part A covers radiation given while you are a hospital inpatient, and Part B covers outpatient radiation.

How much does radiation therapy cost with Medicare?

If you get radiation as an outpatient, which is the most common way, you pay 20% of the Medicare-approved amount after meeting the Part B deductible ($283 in 2026). If radiation is given during a hospital inpatient stay, you pay the Part A deductible ($1,736 per benefit period in 2026) and any coinsurance instead.

Is radiation therapy covered under Part A or Part B?

Both can apply. Part A covers radiation delivered while you are admitted as a hospital inpatient. Part B covers outpatient radiation, whether it is given in a hospital outpatient department or in a doctor's office or freestanding radiation clinic.

Does it cost more at a hospital than a freestanding clinic?

For your share of the bill, no. Part B covers outpatient radiation at the same 20% coinsurance after the deductible whether it happens in a hospital outpatient department or a freestanding radiation clinic. The setting changes how Medicare pays the provider, not your coinsurance rate.

Does Medicare cover proton therapy and IMRT?

Modern techniques, including IMRT, SBRT, stereotactic radiosurgery, brachytherapy, and proton beam therapy, are covered when they are medically necessary. Whether a specific technique is covered for a specific diagnosis is governed by Medicare's national and local coverage determinations, so your radiation oncology team is the right source for whether the recommended technique is covered in your case.

Learn More

MedicareHow Medicare Covers Cancer TreatmentHow Medicare cancer treatment is covered in 2026: Part A and B chemo, radiation, oral drugs, and the $2,100 Part D cap that ends out-of-pocket drug costs. MedicareDoes Medicare Cover Clinical Trials?Medicare covers routine costs of qualifying clinical trials, like office visits and tests, at your usual 20% coinsurance. See what is covered and what you pay. MedicareMedicare Preventive Services: What You Get for FreeMedicare preventive services are mostly free: two wellness visits, screenings, and vaccines at $0, plus the billing trap that can turn free into a charge.

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The information on Brevy.com is for educational purposes only and is not a substitute for professional legal, financial, or medical advice. Rules vary by state and program and change frequently. Always verify with the relevant agency or a qualified professional. Brevy is not a law firm, financial advisor, or healthcare provider.

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Brevy Care Team

Expert eldercare guidance from Brevy's team of healthcare professionals and researchers.